The device only supports 125KHz operating frequency. Please check your card before purchasing to make sure you need the machine to work at the frequency you need | The device is powered by two AAA batteries. Please note that the batteries are not included in the package and you need to buy them yourself | Ergonomic design, easy to grip, with slight bumps on the front and back to achieve better anti-slip effect | Warm reminder, copying is not 100% successful. If the machine prompts that the operation failed, you can try to adjust the distance and position between the machine and the card